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directive-export.mk revision 1.9 
      1 # $NetBSD: directive-export.mk,v 1.9 2023/08/20 20:48:32 rillig Exp $
      2 #
      3 # Tests for the .export directive.
      4 #
      5 # See also:
      6 #	directive-misspellings.mk
      7 
      8 # TODO: Implementation
      9 
     10 INDIRECT=	indirect
     11 VAR=		value $$ ${INDIRECT}
     12 
     13 # Before 2020-12-13, this unusual expression invoked undefined behavior since
     14 # it accessed out-of-bounds memory via Var_Export -> ExportVar -> MayExport.
     15 .export ${:U }
     16 
     17 # A variable is exported using the .export directive.
     18 # During that, its value is expanded, just like almost everywhere else.
     19 .export VAR
     20 .if ${:!env | grep '^VAR'!} != "VAR=value \$ indirect"
     21 .  error
     22 .endif
     23 
     24 # Undefining a variable that has been exported implicitly removes it from
     25 # the environment of all child processes.
     26 .undef VAR
     27 .if ${:!env | grep '^VAR' || true!} != ""
     28 .  error
     29 .endif
     30 
     31 # No syntactical argument means to export all variables.
     32 .export
     33 
     34 # An empty argument means no additional variables to export.
     35 .export ${:U}
     36 
     37 
     38 # Trigger the "This isn't going to end well" in ExportVarEnv.
     39 EMPTY_SHELL=	${:sh}
     40 .export EMPTY_SHELL	# only marked for export at this point
     41 _!=		:;:	# Force the variable to be actually exported.
     42 
     43 
     44 # If the '.export' directive exports a variable whose value contains a '$',
     45 # the actual export action is deferred until a subprocess is started, assuming
     46 # that only subprocesses access the environment variables.  The ':localtime'
     47 # modifier depends on the 'TZ' environment variable, without any subprocess.
     48 export TZ=${UTC}
     49 # expect+1: 00:00:00
     50 .info ${%T:L:localtime=86400}
     51 INDIRECT_TZ=	${:UAmerica/Los_Angeles}
     52 TZ=		${INDIRECT_TZ}
     53 .export TZ
     54 # expect+1: 00:00:00
     55 .info ${%T:L:localtime=86400}
     56 _!=	echo 'force exporting the environment variables'
     57 # expect+1: 16:00:00
     58 .info ${%T:L:localtime=86400}
     59 
     60 
     61 all:
     62